Pyrites briquet and process of making same.



ATE @lfi ll lltglll JACQB S. EOBESQN, 01" CAMDEN, NEW JEIIRfiEY.

PYRITE BRIQUET AND PROCESS OF MAKING Ltlmfifild.

Ito Drawing.

.To all whom it concern:

Same, of which the following is a specification. I v

My invention relates to the treatment of relatively fine particles of sulfur-bearing material for the purpose of facilitating the handling of the same in the commercial arts.

Among the most common form of sulfurbearing materials known, are the iron pyrites and cupreous pyrites from which sulfur is recovered as such or as sulfur dioxid, by the usual roasting operation. It is desirable to form the fine particles of such pyrites, or what is known as pyrites fines" into lumps or-masses, commonly termed briquets, for convenience in roasting or burning. Numerous methods have been proosed for briqueting fine particles of sulfurearing material, notably iron-pyrites, and binders of various materials have been em ployed with more or less success. In general, however, the binders have added ma terially to the cost, or imported into the block or briquet elements which hinder the free elimination of the sulfur therefrom; and they are not moisture resisting.

My invention consists in forming the relatively fine particles of sulfur-bearing mate rial, including iron pyrites and cupreous pyrites, which are commonly termed pyrites fines or pyrites smalls l, which cannot be handled commercially, into blocks or bri quets, preferably by combining them with Waste sulfite liquor as a bonding agent. The amount of sulfite liquor employed need only be such quantity as will render the whole mass sufficiently plastic to permit of its be ing molded into the desired shape or form which is subsequently dried or baked.

My invention consists further of a nonhydroscopic briquet of sulfur-bearing material united and briqueted by a binder having sufficient sulfur to combine with the bases contained in it, and,.therefore, incapable'of absorbing any of the sulfur dioxid liberated in burning the briquet; preferably also, this binder is capable of yielding some sulfur to add to that yielded in burning the briquet.

The briquet forming the subject of my invention is composed of relativelv fine nar- Speoiflcation of Letters Patent. Application filed December 7, 1905. Serial No. 290,799.

- Patented Jan. 2, jlfi'llil.

ticles of sulfur-bearing material, which ma terial may include pyrites lines or pyrites smalls and a binder, preferably consisting of the waste liquor resulting from the manufacture of paper pulp from wood c and other fibers by the action of boiling such fibers under pressure in a solution of an acid sulfite. By preference I employ a vacuum concentrate of this liquor made in accord ance with the process set forth inmy Patent No. 833,634, dated October 16, 1906, in which is set forth a method of treating this raw waste liquor by rendering it substantially neutral with the aid of milk of lime or other suitable alkaline material and then quickly concentrating such neutralized body in 'vacuo without decomposition, to a desirable density. I have discovered that the use of such sulfite liquor as a bonding agent for the relatively fine particles of sulfur-bearing material, including iron pyrites and enpreous pyrites. produces a non-hygroscopic Water for a period of from one to ten days. i

The burning of briquets made in accordance with my invention, therefore, is more readily accomplished since they do not absorb Water, in transportation or storage and therefore the amount of water to be driven oil during the roasting operation is so greatly reduced as to require less fuel in accomplishing the result desired, viz.,- the free elimination of the sulfur from the non-sulfur content oil? the material.

Inasmuch as the waste sull'ite liquor con tains a quantity of sulfur compounds re tained from the original liquor employed in making the cellulose pulp, briquets made from sulfur-bearing material and this liquor as a bonding agent. are richer in sulfur than those in which a non-sulfur bonding agent is employed. The sulfur in the sulfite liquor is about double the amount Eli) Elli

of that required to saturate the bases lit pyrites smalls, is'prefe'rably mixed in -consumed during the burning operation,

render this agent ideal for the purpose of bonding-briquets of sulfur-bearing material including ferrous and cupreous pyrites.

Sulfite liquor as ordinarily prepared contains some calcium sulfate and calcium sulfite in addition to its characteristic organic sulfonate of calcium, and these bodies contribute to its binding action. Since they contain enough sulfur to saturate their base they do not absorb sulfur dioXid from the pyrites in burning,

In preparing the briquets in accordance with my invention, the sulfur-bearing material, which may include pyrites fines or any suitable manner with the addition of so much of the sulfite liquor as will render the mass sufiiciently plastic to permit of its being molded to the desired shape or form, which amount of such liquor Will vary, depending upon the size of the partieles employed, the apparatus and the manner of mixing. The plastic massiso made is then pressed into blocks or briquets of the desired shape and size, and preferably dried by the agency of heat, or baked in a suitable oven. When dry or relatively so the briquets are ready for use;

Although I have described my improved briquet and the process of making the same with especial reference to pyrites, it will be understood that my invention includes and the claims hereinafter set forth are broad enough to cover, the bonding together of any form of sulfur-bearing material, including pyrites fines or pyrites smalls, whether of aferrous,cupreous,nickeliferous or other analogous composition, as well as any material composed mainly of metallic sulfids such as sulfid of iron, with a binder such as sulfite liquor comprising enough or more than enough sulfur to combine with the bases present in such binder or present as impurities in the material briqueted.

I claim: 5

1. The process herein described of preparing pyrites smalls for desulfurization, said process consisting in moistening the smalls with the liquor resulting from the manufacture of sulfite cellulose pulp, and

non-hygroscopic briquet of sulfur-bearing material, bonded by sulfite liquor. I

4. As a new article of manufacture, a non-hygroscopic briquet of pyrites smalls, bonded by sulfite liquor.

5. The briquets herein described, containing pyrites, calcium sulfate and calcium sulfite.

6. The process herein described of preparing sulfur-bearing material composed mainly of metallic sulfids, said process consisting in moistening such sulfur-bearing material with a binder, said binder comprising a mass of sulfite waste liquor and containing at least sufiicient sulfur to combine with the bases therein, and then forming the moistened mass into briquets.

In testimony whereof I have signed my name 'to this specification, in the presence of two subscribing witnesses.

JACOB S. ROBESON.

WVitnesses:

MURRAY C. BOYER, Jos. H. KLEIN. 

